#include <stdio.h>

void printhex(int hex) {
    int digits[8]; // Assuming the maximum digits needed for a 32-bit integer
    int i = 0;

    // Extract hexadecimal digits
    while (hex != 0) {
        digits[i] = hex & 0xF;  // Extract the last 4 bits (hexadecimal digit)
        hex = hex >> 4;         // Shift right by 4 bits
        i++;
    }

    // Print the digits in reverse order
    for (int j = i; j >= 0; j--) {
        printf("%x", digits[j]);
    }
}

int main() {
    int hex = 0x0000;
    int x = hex;
    int count = 0;

    // Count the number of bits set to 1 in the hex value
    while (hex != 0) {
        if ((hex & 0b1) == 1) {  // Check the least significant bit
            count++;
        }
        hex = hex >> 1;  // Shift right by 1 bit (for binary bit checking)
    }

    printhex(x);         // Print the hexadecimal value
    printf("\n");

    int mask = 1 << 4; // Shifts 1 to the left by 3 bits, which results in 0b00001000

    x = x | (0b0001000000000001);

    printhex(x);
    printf("\n");

    x = x | mask;

    printhex(x);
    printf("\n");
    
    printf("\n%d", count);  // Print the count of 1 bits

    return 0;
}